[Devel] [PATCH VZ10 v3 0/9] Add per-VE failcount support

[Vladimir Riabchun]

This patchset introduces per-VE failcount support.
We have several resources, that have per-VE limits,
the users might want to know what limit hits make
operations fail.

- Patch 1 is cosmetic, nothing special.
- Patch 2 is a bugfix, found when testing per-VE mount
  limits (but now comes before these changes).
- Patches 3-5 change mount number and limit processing,
  unifying it with other resources. VE selftest is updated
  in patch 4.
- Patch 6 greatly reduces the amount of copy-pasted code
  by introducing some useful macros.
- Patch 7 adds per-VE failcount file.
- Patch 8 adds new helpers to our VE selftests infra.
- Patch 9 introduces new VE selftest, that checks mounts
  accounting, limits and failcount updates.

https://virtuozzo.atlassian.net/browse/VSTOR-135520

Changes since v2:
- Extract ve_ns_owner update to a separate commit.
- Fix null dereference in ve_mount_put on error path,
  rework is_pseudosuper handling.
- Remove dead sysctl_ve_mount_nr from ve.h in patch 5.
- Add static const to ve_failcounts in patch 7.
- Cover VE_FC_ENTRY(aio) with ifdefs in patch 7.
- Add new selftests helpers in patch 8.
- Add new selftest in patch 9.

Changes since v1:
- Rebase to rh10-6.12.0-211.30.1.14.x.vz10-ovz
- Fix issues in patch 3 by passing ve value to
  ve_mount_put helper and removing is_pseudosuper
  check.

Vladimir Riabchun (9):
  ve/ve.{h,c}: Farewell to spaces as indents
  ve/namespace: Fix UAF in alloc_mnt_ns
  ve/fs: Rework per-ve mount count
  selftests/ve: Update ve_ns_owner_test
  ve: Move from global VE mounts limit to per-VE limit
  ve/ve.c: Generate VE resource accessors using macros
  ve: Introduce per-VE failcount
  selftests/ve: Add more helpers
  selftests/ve: Add mount accounting selftest

 fs/aio.c                                      |   1 +
 fs/mount.h                                    |   1 +
 fs/namespace.c                                |  83 +++--
 include/linux/ve.h                            |  25 +-
 kernel/bpf/syscall.c                          |   1 +
 kernel/ve/ve.c                                | 278 +++++++-------
 kernel/ve/veowner.c                           |  19 -
 net/core/dev.c                                |   2 +
 net/core/neighbour.c                          |   1 +
 net/core/net_namespace.c                      |   4 +-
 tools/testing/selftests/ve/.gitignore         |   1 +
 tools/testing/selftests/ve/Makefile           |   1 +
 .../selftests/ve/ve_mount_accounting_test.c   | 339 ++++++++++++++++++
 tools/testing/selftests/ve/ve_ns_owner_test.c |  35 +-
 tools/testing/selftests/ve/ve_selftest.h      |  79 +++-
 15 files changed, 648 insertions(+), 222 deletions(-)
 create mode 100644 tools/testing/selftests/ve/ve_mount_accounting_test.c

-- 
2.47.1